Questions on the manipulation of String objects in Mathematica, and the functions used for these manipulations.

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22
votes
3answers
1k views

How to join two Style[]d strings

Does anyone know whether it is possible to combine\join two styled strings? That is, while the following code works fine: omega = "text"; omega<>omega ...
23
votes
4answers
3k views

Looking for “Longest Common Substring” solution

I'm looking for robust code to solve the "Longest Common Substring" problem. I can just code it up from that description, but I'd thought I'd ask here, first, in case someone knows of an ...
3
votes
3answers
449 views

Converting a string containing whitespace-delimited numbers to a list of numbers

Suppose I have a string str that contains only whitespace-delimited real numbers: ...
16
votes
2answers
874 views

How do I perform string matching and replacements?

What are, and how do I use Mathematica's string matching and replacement tools?
6
votes
2answers
144 views

Why is StringMatchQ[“IP1”, “IP”] returning False?

Maybe there is a knot in my head, but I would expect that StringMatchQ["IP1", "IP"] should return True (which it does not) ...
7
votes
3answers
511 views

Specifying string patterns in DeleteCases

It seems that DeleteCases is not compatible with string patterns, at least directly (see, for example, this question). Is this true? If so, why is this the case? ...
5
votes
3answers
292 views

Thousands separator (comma) option for NumberString/StringCases?

I've been looking for a way to read numbers that have thousands separators in them: StringCases[" 1142.123 ", Whitespace ~~ NumberString ~~ Whitespace, 1] gives ...
5
votes
5answers
446 views

Extracting columns of text from a rectangular string

I have very large rectangular strings (on the order of 30-100 MB in size), which I import into Mathematica from text files using a command like ...
14
votes
3answers
439 views

Grabbing a number of characters around a string pattern

If I have some string data: text = StringTake[ExampleData[{"Text", "DeclarationOfIndependence"}], 400] "When in the Course of human events, it becomes ...
3
votes
3answers
118 views

Using NumberString, DigitCharacter, or a similar directive to find all string representations of integers in a string

I have a text file containing many, many lines of text like test in the following: ...
3
votes
5answers
303 views

How to extract strings from the list with an additional condition on previous elements?

There are a long list of strings $s$ and two lists of substrings $s1$ and $s2$. I want to take all elements of $s$ which contain a substring from $s2$ and such that before it on no more than $n$ ...
10
votes
7answers
211 views

DateList coupled with String Operations

Through some webscraping, I have the following list: ...
5
votes
3answers
167 views

DateList's aggressive interpretation of TimeML duration codes

DateList "aggressively" interprets strings, such as "p72h": DateList["p72h"] gives ...
4
votes
4answers
514 views

Creating lists from a string, separating words from numbers

Say I have a string that contains numbers and words, such as this one: string = "there are 1234 words and numbers 5678 in here $999"; How would I separate the ...
5
votes
1answer
265 views

import complete date string to mathematica

Based on an example from here I try to parse dates from a table including the time, but it fails. This is the modified example: ...
11
votes
2answers
309 views
2
votes
4answers
182 views

Remove anything between () except for ; in a string

A simple question but I can't find the answer. I'm scanning a huge pile of mails and would like to get rid of anything between () in the email adresses since this normally contains just info that ...
16
votes
1answer
447 views

NotebookFind and String Pattern Expressions

Is there a way that NotebookFind can be used to match string pattern expressions rather than just strings? The documentation for ...
6
votes
2answers
260 views

How to choose variables from a list for a function and then use the solution in a subsequent function?

I am trying to calculate heating degree days and cooling degree days and output that information to a table. I am using mathematica's curated data to do this. In text this is what I would like to ...
12
votes
2answers
329 views

Split a Unicode string maintaining uppercase characters

I want to split a string according to a predefined set of substrings (lowercase), though the actual text can contain uppercase characters anyplace. The task is to find the matches, longer preferred ...
8
votes
1answer
234 views

Creating a version of SequenceAlignment that accepts patterns

SequenceAlignment seems like a function that is not (yet?) fully integrated into Mathematica. I want a function that accepts general patterns instead. I ...
11
votes
2answers
224 views

Pasting “rectangles” of text side-by-side

In Emacs/Xemacs, there is a rectangle feature, such that you can delete, copy, etc., "rectangles" of text. Now suppose I have two text files, each containing one column of numbers. Is it possible to ...
9
votes
2answers
228 views
8
votes
2answers
319 views

Keeping Quotation Marks in Output

I am running into the following seemingly simple problem. I have this code: testphrase="i love you"; input=ToLowerCase[StringSplit[testphrase, Whitespace]] It ...
10
votes
2answers
216 views

What's a robust way to insert another extension into a filename?

I'd like to add an extension to a filename before the file extension, otherwise leaving the given filename the same. In particular, absolute filenames should stay absolute, and relative filenames ...
15
votes
4answers
795 views

Finding all dictionary words that can be made with a given set of characters (Wordfeud/Scrabble)

This is a slightly more involved variant of this recent question. By sheer coincidence I happened to have been building a Wordfeud (Scrabble clone) game in Mathematica. My interactive Wordfeud ...
17
votes
6answers
692 views

Split a string at specific positions

Given a string of alphanumerical characters, how to split it simply and quickly at the center of continuous letter-substrings? Is there an elegant and fast solutions out there in the "computational ...
6
votes
3answers
765 views

print the name of the variable in a list without evaluation

a := az + 1 b := bz + 5 list := {a, b} I'd like mathematica to print a = az + 1 b = bz + 5 so basically it needs to first ...
5
votes
2answers
360 views

Custom distance metric for agglomerative clustering in Mathematica

Is it possible to have a custom distance metric defined to determine the distance between two clusters in Agglomerative clustering in Mathematica? I have a 3 dimension data with string values along ...
12
votes
7answers
678 views

DeleteCases on list of Strings

Consider the following: data={"AB","CD","AF"}; Now I would like to delete all String from data which starts with "A". ...
6
votes
1answer
259 views

Interpreting text entry and splitting it in a Manipulate text field?

I have the following program that plots the number of trigram appearances across a corpus of textual information between 1964 and 1989 (apologies for the messy code): ...
22
votes
7answers
985 views

Splitting words into specific fragments

I am looking into splitting words into a succession of chemical elements symbols, where possible. For example: Titanic = Ti Ta Ni C (titanium, tantalum, nickel, carbon) A word may or may not be ...
7
votes
3answers
216 views

How to turn a set of strings which represent a list into a 2D list

I have a set of data read in from a larger CSV file. I want it to match the format I have from another analysis. It is structured as a series of strings with letters and numbers Here it is copy-pasted ...
15
votes
2answers
409 views

Unicode-aware string functions?

I've recently discovered that ToUpperCase is quite unreliable on non-ASCII input: ...
-2
votes
1answer
206 views

How to set a rule in pattern matching to change a string from one form to another

I want to define a rule that will change a particular type of string to another form. For example:- a string having ...
10
votes
2answers
567 views

How to get string representation (like repr in Python)

I have a string variable. I want to obtain another string which contains the representation of the string variable content itself. s = "a \n b" I need to get a ...
4
votes
1answer
284 views

Defining a string based sort function

I'm having a bit of trouble figuring out the right Sort syntax to use on a list of lists. Consider the following list: ...
6
votes
1answer
225 views

How to set up new types for pattern matching strings?

Consider the following toy example: I have a set of language sounds, which I partition into two exclusive subsets, consonants and vowels. I want to set up string patterns for e.g. ...
15
votes
2answers
552 views

Lexicographic ordering of strings in Mathematica

I recently realized that Mathematica seems incapable of comparing strings in the "normal" expected lexicographic order. Indeed, for some simulations, I need to process text directly, without fiddling ...
6
votes
2answers
456 views

How to overload System`StringJoin to automatically use ToString on arguments?

I am using an overloaded version of the StringJoin function since years now, without any problem, as I've invested a lot of time and effort earlier to make its ...
15
votes
7answers
2k views

How to express an integer number in English words?

How do I convert a number to a readable string? I would like to implement a function, inWords[], inWords[n_]:= ? which ...
7
votes
2answers
273 views

Revert FullForm-ed text to prettyprinted

Sometimes strings in a notebook/package file end up garbled due to some unknown/unintentional conversion of the expression/cell/notebook. I could not find a way to revert such unreadable text to its ...